# message='Hello python world!'
# print(message)
#
# message='Hello python Crash Course world'
# print(message)

# message='Hello python Crash Course reader'
# print(mesage)      # 报错nameerror

# print('I told my friend ,"python" is my favorite language')

# 数中的下划线  ，书写很大的数时，可使用下划线将其中的数字分组
# universe_age=14_000_000_000
# print(universe_age)
# print(14_000_000_000)

# x,y,z=0,5,6
# print(x,y,z)

# favorite_num=4
# print(f"my favorite number is {favorite_num}")

#import this       # python之禅的导入

#bicycles=['trek','cannondale','redline','specialized']
# print(bicycles)
# print(bicycles[0])         #[]中是索引
# print(bicycles[-1])
# print(bicycles[0].title())

# message=f'my favorite bicycle is {bicycles[0].title()}'
# print(message)




































